Telephone desk set



Dec. 10, 1929. OBERGFELL 1,738,919

TELEPHONE DESK SET Filed July 20, 1927 2 Sheets-Sheet 1 g- HEI'EFFTF EJ 1 31 Dec. 10, 1929- H. F. OBERGFELL v1,738,919

TELEPHONE DESK SET Filed July 20, 1927 2 Sheets-Sheet 2 y Hr Patente Dec. 10, 1929' [TED STATES PATENT OFFICE HERBF F. ()IBERGFELL, RIVER FOREST, ILLINOIS, ASSIGNOB T01 AUTOMATIC ELECTRIC ING, 01E CHICAGO, ILLINOIS, A CORPORATION 0F DELAWARE rnnnrnonn nnsntsnr 'npplication filed July 2h,

The present invention relates in general to telephone desk sets, but is particularly concerned with the improvement of a telephone desk set of the cradle type; and the objects a of the invention are to improve the construction and design in a manner tending to simplify its manufacture, placing the operating parts at a point more readily accessible for repair or adjustment, and to improve the gento oral appearance of the set as a whole, and at the same time reduce the manufacturing cost. 'lhis application is in part a continuation of an application bearing Serial No. 22,7158, filed May 8, 1925. In telephone desk sets of it the present type, heretofore hrown to applicant, it has been the usual practice to place the spring combination, used in switching the substation circuits from sialing to ta t1: ing position, in the base of thedesk set. ln at this type of desk set, in order to operate the springs and to provide a place for the hand telephone while not in use, a cradle member is provided. This cradle member, in certain cases, is mounted on a post which operates vertically in the standard, the post entending down into the base into operative relation with the switching springs. in another instance known to applicant, the cradle member is rigid with respect to the standard and base, and a platform supported post is provided. This platform, through the medium of its post, operates the switching springs in the base of the desk set when the hand telephone is placed in the cradle member.

ln applicants invention the cradle member and standard are formed in one piece and are held in rigid relation to the base of the set. This cradle member is hollow and provides space for mounting the switching springs in thecradle member itself. The springs are operated by means of a button engaged by the hand tele hone when the same rests in the cradle mem er.

lhe sheet of drawings, comprising Figs;

1-9, inclusive, taken in connection with the following detailed description is believed to be suflicient to makethe invention clear.

Fig. 1 is a top view of the desk set with the exception that no hand telephone is all shown, the invention not being concerned l92'l. Serial No. 207,028.

Numeral 5 in this figure indicates an opening I in the'base provided for the usual dial device.

Fig. 2 shows a sectional view of Fig. 1 in elevation on line A-A, only certain parts, however, being shown in cross section.

11: Fig. 3 shows a modified spring combina- "ion.

Fig. 4 shows one of two like brackets used to hold the spring combination in place in the cradle member.

Fig. 5 is a view of a portion of the bracket 10 showing how the member 18 is cut away to make room for the switching springs.

Fig. 6 is a bottom view of the spring assembly and its associated operating mechanism when removed from-the cradle member.

Fig. 7 diagrammatically illustrates the in vention applied to a typical sub-station tele phone circuit.

Fig. 8 is a sectional view of Fig. 1 similar to the view shown in Fig. 2; shows a different type of spring operating buttdn; and shows the same sufli-ciently depressed by a hand telephone to operate the springs.

Fig. 9 shows the operating button as seen when looking in the direction indicated by the arrow, but is shown double actual size.

The base is of standard construction, identical to that disclosed in an Erickson and Obergfell Patent No. 1,612,621, issued ]Dec. 28, 1926, thecradle member 2 of the present application being merely substituted for the standard 3 of the application referred to.

The entire operating'mechanism is mounted on a bracket 10, shown in Figs. 1, 2 and 6, and partly shown in Fig. 5. As will be apparent from Fig. l, the edges of bracket 10 are bent at right angles to that portion shown in cross section in Fig. 2, and act in the capacity of mounting brackets for the spring combination comprising springs 23 26, inclusive. A member 18 is riveted to member 10 and acts as a guide for pin 22 and also cooperates with nut 31 to hold cover 30 in place over the spring assembly. In order to provide clearance for springs 24 and 26 the member 18 is cut away as shown in Fig. 5.

Pivoted to bent over portions 16 of the member 10 is a bracket or lever 19, having cars 33 drilled to .receive the pivot pin 28 which extends through the portions 16 of the bracket 10. The other end of member 19 is provided with ears 32 which are drilled to receive a pivot pin 36 which extends through a link 27. The other end of this link 27 is pivotally secured to the vertical pin 22 lying within the member 18. As will be apparent from observation of Figs. 1 and 2, the pin 22 is normally held in the position shown in Fig. 2 by the tension of springs 23 and 25 against rollers 21 which are secured to member 19 by the rivets 20.

The described mechanism, in its completely assembled form, as shown in Fig. 6, is

placed in the cradle member and held in position by the two brackets 17 (see Figs. 2 and 4) which are held in place by screws entering threaded openings. in the cradle member. The cover plate 30 rests on ledges cut out on the eradlemember 2 and is held in place. by a nut 31 which co-operates with part 18. The nut 31 has notches cut out of its edges so that it may be tightened with a spanner type wrench.

When the hand telephone is in place its weight as it rests on pin 22 is sufficient to overcome the tension of springs 23 and 25, causing pin 22 to be pressed downward, which results in the lever 19 being moved to cause the rollers 21 to separate springs 23 and 25 from their respective connections with v springs 24 and 26.

The leverage between the pin 22 and the rollers 21 is such that a very small amount of pressure on the member 22 is required to cause springs 23 and 25 to disengage themselves from connection with springs 24 and 26, and the springs are so adjusted that oneeighth of an inch movement of the member 22 causes the switching operation to take place, so that even if the cord connecting the hand telephone with the base should get entangled between the hand telephone and the cradle, the member 22 will still be effective to properly operate the switching springs.

Of course, it will be understood that the proper connections to the switching springs 2326 are made in the usual manner and the leads are brought down through the cradle standard and connected to a distributing block such as disclosed in the tioned application.

The normal position of springs 2326 is illustrated diagrammatically in the schematic sub-station circuit shown in Fig. 7, the

previously mensprings being normally separated when the F hand telephone is in place or not in use.

In certain cases it may be'desirable to utilize the desk set with circuits in which both a make and-break spring combination is necessary, such a .combination has, therefore, been shown in Fig. 3.

In the modification shown in Figs. 8 and 9 the single piece button 22 of Figs. 1 and 2 has been replaced by a compound button 22. This button is high enough so that even if a hand telephone is improperly placed on the cradle, as illustrated, it will engage and operate the button sufiiciently to operate the switching springs.

This button is supported in a sleeve member 37 which is in turn connected with the lever 19 by the link 27. The button 22 is held at the top of the sleeve by a helical spring 38 which is so tensioned that the button 22' and sleeve 37 will be moved as one until lever 19 engages the wall of the cradle member 2. At this time the top of sleeve 37 has been brought flush with the outer surface of the cradle member. If the hand telephone is properly placed in the cradle the tension of spring 37 will now be overcome and the button 22 will be telescoped within sleeve 37 flush with the cradle member. The operative advantage of a button of this kind is, due to its effective length, no matter whether the connecting cord is tangled and lying between the hand telephone, or whether the hand telephone is replaced in the improper manner shown, the button will still be operated sufficiently to actuate the switching springs.

From the foregoing it will be appreciated that applicant has designed and constructed a new and improved type of portable desk set which has distinct advantages over desk sets heretofore known. The features considered novel are set forth in the claims which follow.

What is claimed is:

1. A portable desk set comprising a base and standard therefor, a cradle member integral with said standard and adapted to support a hand telephone, switching mechanism mounted in said cradle member, and means associated with said switching mechanism projecting from the cradle member, the same means causing the operation of said switching mechanism upon the association and disassociation of the hand telephone with'the cradle member.

2. A portable desk set comprising a base and standard, a cradle member integral with said standard and adapted to support a hand telephone, and switching mechanism located solely within the cradle member.

3. A portable desk set, a base having a standard eccentrieally mounted thereon, a cradle member integral withand extending laterally of the standard, an operating member lying in a plane at right angles to the cradle member and co-operating with a hand telephone as the same is associated and disassociated from the cradle, and switching mechanism in said cradle member operated upon the movement of said operating member.

4. In a portable desk set, a cradle member.

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sub-station circuit switching springs located within said cradle member, and mechanism t'or operating said springs,

5. ln a portable desk set,'a cradle member, sub-station circuit switching springs located within said cradle member, mechanism for operating said springs comprising a pivoted lever carrying rollers engaging said springs, and'a pin for operating the lever adapted to be operated by a hand telephone 6. in a desk set, a cradle tor receiving a hand telephone, atelescoping member pro jecting upwardly from said cradle, circuit switching springs, means operable by said member t'or operating said springs, and means within said member preventing any. actuation between the telescoping elements oi said member occurring until alter said springs have been operated.

l, in a cradle type telephone set, a set o'l switching springs, a telescoping member operable to bring about the operation ot said springs and means within the said member tor preventing any telescopic action occurring until alter the springs have been oper ated.

a. la a telephone deslr set ot the cradle type, a compound member protruding upward trom the base oil the cradle member,

means tor depressing said compound member opening in. the center oil the upper suriface ot the cradle, whichsurtace is otherwise completely enclosed, and a small button eatending trom said opening and directly engaging the center ot the bar ot the hand telephone only, said button being the only movable element on the cradle tor operating the switching mechanism,

12. lln a portable deslr set, a cradle member having upwardly projecting extensions for receiving a hand telephone, sub-station circuit switching springs adapted to be operated by said hand telephone when the same is associated withand disassociated irom the cradle, and lever means associated and movable with respect to said cradle tor operating said springs.

18. in a deslr set, a hollow cradle member open at the top, switching springs within said 'cradle, a button t'or operating said. springs extending above the top of the opening in said cradle, a cover for said opening surrounding said button, and means surrounding said button tor holding said cover in place.

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until one ct its portions is tlush with the outer surtace oil said cradle member, means tor pre venting turther movement oi the said one portion oit said member, and means therea'lter elitective to permit said first means to depress another portion o'l said member flush with the outer surtace oit said cradle member,

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9., in a portable dosh set, a cradle member tor receiving a hand telephone, a circular member projecting upwardly trom the center ot said cradle directly engaged and moved by a hand telephone when placed upon. said cradle member, and sub-station circuit switch. ing mechanism operable by said circular member.

lb, in a portable deelr set comprising a base and a standard, a cradle integral with said standard and arranged to support a hand telephone, sub-station circuit switching springs located horiaontally within said cradle, a member projecting itrom the center lltl oi said cradle andperpendicularly to said springs, and lever means cooperating with said member and said springs arranged to operate said springs when said hand tele phone is associate l with and disassociated trom the cradle.

ll. lln a telephone deslr set,.a base, a cradle member integral therewith tor supporting a hand telephone, switching mechanism can closed within the set, said cradle member be.

ing completely lined and immovable and having a pair ot torlred members preventing side movement oil; the hand telephone, a small.

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